Optimize your Subaru STI 2015-2021 engine's performance with a comprehensive range of top-quality aftermarket parts from industry-leading brands. Elevate the power and efficiency of your vehicle with ETS, HKS, Perrin, Mishimoto, AMS, Grimmspeed, Cobb, Remark, PLM, Turbosmart, IAG Performance, and more. Enhance airflow and filtration through AIR INTAKE DUCTS and COLD AIR INTAKES, while maintaining engine cleanliness with AIR OIL SEPARATORS and CATCH CANS. Experience impeccable control and responsiveness with BLOW OFF VALVES and BOOST CONTROL SOLENOID COVERS, complemented by the reliability of ENGINE MOUNTS and meticulously crafted ENGINE MANAGEMENT HARNESSES. Simplify maintenance and improve overall performance with DIPSTICKS and explore comprehensive ENGINE PACKAGE DEALS for a holistic approach to upgrading your Subaru WRX's engine. Unleash the full potential of your vehicle through precision-engineered components designed to deliver both power and durability, all meticulously designed to give your Subaru STI the edge on the road or track.
2015-2021 Subaru WRX STI Engine Parts
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![COBB [02 - 14 WRX, 07 - 21 STI, 07 - 12 Legacy GT, 06 - 13 Forester XT] Top Feed 1050X Fuel Injectors | 312150 - JDMuscleFuel Injectors and Accessoriescobb312150](//jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-07-21-sti-07-12-legacy-gt-06-13-forester-xt-top-feed-1050x-fuel-injectors-312150-5750979.jpg?v=1770336558&width=220)
![COBB [02 - 14 WRX, 07 - 21 STI, 07 - 12 Legacy GT, 06 - 13 Forester XT] Top Feed 1050X Fuel Injectors | 312150 - JDMuscleFuel Injectors and Accessoriescobb312150](//jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-07-21-sti-07-12-legacy-gt-06-13-forester-xt-top-feed-1050x-fuel-injectors-312150-9693839.jpg?v=1770336559&width=220)
In StockCOBB Top Feed 1050X Fuel Injectors
Fits: 02-14 WRX, 07-21 STI, 07-12 Legacy GT, 06-13 Forester XT
Regular price $625.00Sale price $625.00 Regular priceUnit price per$625.00 -
Up to $156 off
In StockPLM Power Driven Subaru EWG 3-Bolt Up Pipe & Dump Tube 38mm WRX 2002-2014 / STI 2004-2020 / Baja Turbo 2004-2006 / Forester XT 2004-2013 / Legacy GT 2005-2009 / Outback XT 2005-2009 | PLM-SUB-UP-PIPE-EWG-38MM-3B
Only 8 leftRegular price $339.00Sale price $339.00 Regular priceUnit price per$495.00 -
![GrimmSpeed [15-21 WRX/STI] Bumper Bar Black Powder | 090261 - JDMuscleIntercooler Installation Kitsgrm090261](//jdmuscleusa.com/cdn/shop/products/grimmspeed-15-21-wrxsti-bumper-bar-black-powder-090261-7439986.jpg?v=1783897824&width=220)
![GrimmSpeed [15-21 WRX/STI] Bumper Bar Black Powder | 090261 - JDMuscleIntercooler Installation Kitsgrm090261](//jdmuscleusa.com/cdn/shop/products/grimmspeed-15-21-wrxsti-bumper-bar-black-powder-090261-5782082.jpg?v=1783897824&width=220)
In StockGrimmSpeed Bumper Bar Black Powder | 090261
Fits: 15-21 WRX/STI
Only 8 leftRegular price $285.00Sale price $285.00 Regular priceUnit price per$285.00 -
In StockRemark R1-Spec Catback Exhaust Titanium Muffler Section w/ Burnt Tip | RK-C1076S-01T
Fits: 15-21 WRX/STI
Only 1 leftRegular price $1,095.00Sale price $1,095.00 Regular priceUnit price per$1,095.00 -
Process West 06-21 STI Intake Manifold Street Version Black | PWIM002B
Regular price $2,333.00Sale price $2,333.00 Regular priceUnit price per$2,333.00 -
![Seibon Carbon Fiber Hood/Trunk Prop w/ Seibon Logo [Universal] | HOODPROP-S](//jdmuscleusa.com/cdn/shop/products/seibon-carbon-fiber-hoodtrunk-prop-w-seibon-logo-universal-hoodprop-s-hood-dampers-seibon-seihoodprop-s.jpg?v=1614519856&width=220)
![Seibon Carbon Fiber Hood/Trunk Prop w/ Seibon Logo [Universal] | HOODPROP-S](//jdmuscleusa.com/cdn/shop/files/Siebon_Authorized_Dealer_963508de-6254-4ebb-b06f-da40665ca67a.png?v=1738252169&width=220)
Up to $13 off
In StockSeibon Carbon Fiber Hood/Trunk Prop w/ Seibon Logo
Fits: Universal
Regular price $117.00Sale price $117.00 Regular priceUnit price per$130.00 -
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](//jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-red-078006r-2.jpg?v=1614675538&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](//jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-3.jpg?v=1614658553&width=220)
GrimmSpeed Air/Oil Separator | 078006
Fits: 02-07 WRX / 04-21 STI
Regular price $426.00Sale price $426.00 Regular priceUnit price per$426.00 -
In StockGates Micro-V Belt Alternator & Power Steering Belt
Fits: 02-14 WRX, 04-21 STI
Only 6 leftRegular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
In StockWalbro 450lph E85 Compatiable Fuel Pump & Installation Kit | TIA485-2 - Universal
Regular price $206.00Sale price $206.00 Regular priceUnit price per$206.00 -
In StockRemark Stainless Steel Axle Back w/ Single Wall 4 Inch Polished Tips | RO-TSVA-S4
Fits: 15-21 WRX/STI
Regular price $635.00Sale price $635.00 Regular priceUnit price per$635.00 -
Up to $20 off
In StockPerrin Boost Control Solenoid Cover - Neon Yellow
Fits: 08-21 STI
Only 13 leftRegular price $60.00Sale price $60.00 Regular priceUnit price per$80.00 -
Up to $41.05 off
In StockMishimoto X-Line Aluminum Radiator
Fits: 08-14 WRX, 08-21 STI
Only 8 leftRegular price $409.95Sale price $409.95 Regular priceUnit price per$451.00 -
Up to $2.70 off
In StockCusco Oil Drain Plug M20x1.5 - Universal
Regular price $24.30Sale price $24.30 Regular priceUnit price per$27.00 -
![DC Sports [15 - 21 WRX/STI] Catback Single Canister Exhaust Burnt - JDMuscleCat Back Exhaust SystemDC-SCS4305Polished](//jdmuscleusa.com/cdn/shop/files/dc-sports-15-21-wrxsti-catback-single-canister-exhaust-burnt-3048411.webp?v=1770327165&width=220)
![DC Sports [15 - 21 WRX/STI] Catback Single Canister Exhaust Burnt - JDMuscleCat Back Exhaust SystemDC-SCS4305Polished](//jdmuscleusa.com/cdn/shop/files/dc-sports-15-21-wrxsti-catback-single-canister-exhaust-burnt-3446643.webp?v=1770327166&width=220)
Up to $22.49 offDC Sports Catback Single Canister Exhaust Burnt
Fits: 15-21 WRX/STI
Regular price $427.50Sale price $427.50 Regular priceUnit price per$449.99 -
![Velossa Tech Design [15 - 21 WRX/STI] Big Mouth Ram Air Intake Snorkel *RGB Upgrade Available | VT - BM - 0228 - JDMuscleAir Intake DuctsVTDVT-BM-0228-Rec-RD-NRectangularRedNo](//jdmuscleusa.com/cdn/shop/files/velossa-tech-design-15-21-wrxsti-big-mouth-ram-air-intake-snorkel-rgb-upgrade-available-vt-bm-0228-9248696.png?v=1770321493&width=220)
![Velossa Tech Design [15 - 21 WRX/STI] Big Mouth Ram Air Intake Snorkel *RGB Upgrade Available | VT - BM - 0228 - JDMuscleAir Intake DuctsVTDVT-BM-0228-Rec-RD-NRectangularRedNo](//jdmuscleusa.com/cdn/shop/files/velossa-tech-design-15-21-wrxsti-big-mouth-ram-air-intake-snorkel-rgb-upgrade-available-vt-bm-0228-8798540.jpg?v=1770321493&width=220)
Velossa Tech Design Big Mouth Ram Air Intake Snorkel *RGB Upgrade Available | VT-BM-0228
Fits: 15-21 WRX/STI
Regular price From $179.00Sale price From $179.00 Regular priceUnit price per$179.00 -
![Perrin Performance [08 - 14 Subaru Impreza, 15 - 21 WRX, STI] Replacement Foam Filter - JDMuscleAir Intake Filter ReplacementsperX-PSP-INT-324-2](//jdmuscleusa.com/cdn/shop/files/perrin-performance-08-14-subaru-impreza-15-21-wrx-sti-replacement-foam-filter-4247907.jpg?v=1770324910&width=220)
![Perrin Performance [08 - 14 Subaru Impreza, 15 - 21 WRX, STI] Replacement Foam Filter - JDMuscleAir Intake Filter ReplacementsperX-PSP-INT-324-2](//jdmuscleusa.com/cdn/shop/files/perrin-performance-08-14-subaru-impreza-15-21-wrx-sti-replacement-foam-filter-8308968.jpg?v=1770324909&width=220)
Up to $23.25 off
In StockPerrin Performance Replacement Foam Filter
Fits: 08-14 Subaru Impreza, 15-21 WRX, STI
Only 16 leftRegular price $69.75Sale price $69.75 Regular priceUnit price per$93.00
![COBB [02 - 14 WRX, 07 - 21 STI, 07 - 12 Legacy GT, 06 - 13 Forester XT] Top Feed 1050X Fuel Injectors | 312150 - JDMuscleFuel Injectors and Accessoriescobb312150](http://jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-07-21-sti-07-12-legacy-gt-06-13-forester-xt-top-feed-1050x-fuel-injectors-312150-5750979.jpg?v=1770336558&width=220)
![COBB [02 - 14 WRX, 07 - 21 STI, 07 - 12 Legacy GT, 06 - 13 Forester XT] Top Feed 1050X Fuel Injectors | 312150 - JDMuscleFuel Injectors and Accessoriescobb312150](http://jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-07-21-sti-07-12-legacy-gt-06-13-forester-xt-top-feed-1050x-fuel-injectors-312150-9693839.jpg?v=1770336559&width=220)
![GrimmSpeed [15-21 WRX/STI] Bumper Bar Black Powder | 090261 - JDMuscleIntercooler Installation Kitsgrm090261](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-15-21-wrxsti-bumper-bar-black-powder-090261-7439986.jpg?v=1783897824&width=220)
![GrimmSpeed [15-21 WRX/STI] Bumper Bar Black Powder | 090261 - JDMuscleIntercooler Installation Kitsgrm090261](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-15-21-wrxsti-bumper-bar-black-powder-090261-5782082.jpg?v=1783897824&width=220)
![Seibon Carbon Fiber Hood/Trunk Prop w/ Seibon Logo [Universal] | HOODPROP-S](http://jdmuscleusa.com/cdn/shop/products/seibon-carbon-fiber-hoodtrunk-prop-w-seibon-logo-universal-hoodprop-s-hood-dampers-seibon-seihoodprop-s.jpg?v=1614519856&width=220){kind=logo}
![Seibon Carbon Fiber Hood/Trunk Prop w/ Seibon Logo [Universal] | HOODPROP-S](http://jdmuscleusa.com/cdn/shop/files/Siebon_Authorized_Dealer_963508de-6254-4ebb-b06f-da40665ca67a.png?v=1738252169&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-red-078006r-2.jpg?v=1614675538&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-3.jpg?v=1614658553&width=220)
![DC Sports [15 - 21 WRX/STI] Catback Single Canister Exhaust Burnt - JDMuscleCat Back Exhaust SystemDC-SCS4305Polished](http://jdmuscleusa.com/cdn/shop/files/dc-sports-15-21-wrxsti-catback-single-canister-exhaust-burnt-3048411.webp?v=1770327165&width=220)
![DC Sports [15 - 21 WRX/STI] Catback Single Canister Exhaust Burnt - JDMuscleCat Back Exhaust SystemDC-SCS4305Polished](http://jdmuscleusa.com/cdn/shop/files/dc-sports-15-21-wrxsti-catback-single-canister-exhaust-burnt-3446643.webp?v=1770327166&width=220)
![Velossa Tech Design [15 - 21 WRX/STI] Big Mouth Ram Air Intake Snorkel *RGB Upgrade Available | VT - BM - 0228 - JDMuscleAir Intake DuctsVTDVT-BM-0228-Rec-RD-NRectangularRedNo](http://jdmuscleusa.com/cdn/shop/files/velossa-tech-design-15-21-wrxsti-big-mouth-ram-air-intake-snorkel-rgb-upgrade-available-vt-bm-0228-9248696.png?v=1770321493&width=220)
![Velossa Tech Design [15 - 21 WRX/STI] Big Mouth Ram Air Intake Snorkel *RGB Upgrade Available | VT - BM - 0228 - JDMuscleAir Intake DuctsVTDVT-BM-0228-Rec-RD-NRectangularRedNo](http://jdmuscleusa.com/cdn/shop/files/velossa-tech-design-15-21-wrxsti-big-mouth-ram-air-intake-snorkel-rgb-upgrade-available-vt-bm-0228-8798540.jpg?v=1770321493&width=220)
![Perrin Performance [08 - 14 Subaru Impreza, 15 - 21 WRX, STI] Replacement Foam Filter - JDMuscleAir Intake Filter ReplacementsperX-PSP-INT-324-2](http://jdmuscleusa.com/cdn/shop/files/perrin-performance-08-14-subaru-impreza-15-21-wrx-sti-replacement-foam-filter-4247907.jpg?v=1770324910&width=220)
![Perrin Performance [08 - 14 Subaru Impreza, 15 - 21 WRX, STI] Replacement Foam Filter - JDMuscleAir Intake Filter ReplacementsperX-PSP-INT-324-2](http://jdmuscleusa.com/cdn/shop/files/perrin-performance-08-14-subaru-impreza-15-21-wrx-sti-replacement-foam-filter-8308968.jpg?v=1770324909&width=220)